What makes a guy block you then unblock you over night?

we got into a huge fight , and he always blocks me after an argument.

This time he waited hours and then did it. I never blocked back like I usually do and I gave him 0 reaction.

I then notice that I was unblocked overnight which isn’t like him. Usually he’d just keep me blocked.

Why is this?
What makes a guy block you then unblock you over night?
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